--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -344,7 +344,7 @@ cmd_bzip2 = (cat $(filter-out FORCE,$^)
 
 quiet_cmd_lzma = LZMA    $@
 cmd_lzma = (cat $(filter-out FORCE,$^) | \
-	lzma e -d20 -lc1 -lp2 -pb2 -eos -si -so && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
+	lzma e -lc8 -eos -si -so && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 	(rm -f $@ ; false)
 
 quiet_cmd_lzo = LZO     $@
--- a/arch/x86/include/asm/boot.h
+++ b/arch/x86/include/asm/boot.h
@@ -23,7 +23,7 @@
 # error "Invalid value for CONFIG_PHYSICAL_ALIGN"
 #endif
 
-#ifdef CONFIG_KERNEL_BZIP2
+#if defined(CONFIG_KERNEL_BZIP2) || defined(CONFIG_KERNEL_LZMA)
 # define BOOT_HEAP_SIZE		0x400000
 #else /* !CONFIG_KERNEL_BZIP2 */
 # define BOOT_HEAP_SIZE		 0x10000
